131378693 has 2 divisors, whose sum is σ = 131378694. Its totient is φ = 131378692.

The previous prime is 131378641. The next prime is 131378701. The reversal of 131378693 is 396873131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121506529 + 9872164 = 11023^2 + 3142^2 .

It is an emirp because it is prime and its reverse (396873131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131378693 - 2⁶ = 131378629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131378693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131378603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65689346 + 65689347.

It is an arithmetic number, because the mean of its divisors is an integer number (65689347).

Almost surely, 2^131378693 is an apocalyptic number.

It is an amenable number.

131378693 is a deficient number, since it is larger than the sum of its proper divisors (1).

131378693 is an equidigital number, since it uses as much as digits as its factorization.

131378693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 131378693 is about 11462.0544842537. The cubic root of 131378693 is about 508.3642233192.

The spelling of 131378693 in words is "one hundred thirty-one million, three hundred seventy-eight thousand, six hundred ninety-three".